[88762] in North American Network Operators' Group
ignore the word "radical"
daemon@ATHENA.MIT.EDU (Edward B. DREGER)
Thu Feb 16 14:30:55 2006
Date: Thu, 16 Feb 2006 19:30:23 +0000 (GMT)
From: "Edward B. DREGER" <eddy+public+spam@noc.everquick.net>
To: nanog@merit.edu
Errors-To: owner-nanog@merit.edu
Let's look at this a little more carefully.
Pretend for a moment that you operate a network "U". Pretend that
someone else operates a network "E". Pretend that you share a
downstream customer "C". So far, so good.
"C" has several different locations, none of which are directly
interconnected. They advertise their aggregate netblock, which makes
its way to the global table. They also advertise longer prefixes for
you to deliver traffic to the specific location; these are tagged
NO_REDISTRIBUTE.
This does not increase the size of the global table. This does not
require proactive registration of an ASN for every potential customer,
nor for every other transit provider in the world. It does not require
a different ASN for each location "C" has. It does not effect any other
number of wacky things that have been suggested.
It does require peering between "U" and "E", or de-aggregated prefixes
to be leaked between the two. (Ask your transit provider; you're paying
them for this service, so it makes them money.)
Now say that one person from each location sends in a monthly check for
"their" portion of the service. Panic! Horror! Routing no longer
works the same way!
Yes, aggregation means less flexibility. One therefore aggregates likes
together. (Thanks David for the addressing/topology quote.) Some of
you might even do this with your global announcements.
Must "C" renumber when changing providers? Yes. Sounds familiar.
I'm pointing out a way to give consumers dual-homing _today_, using
installed technology.[*] I'm not claiming that it answers the question
of portable /32s. I'm not saying that they'll be able to prepend
AS_PATHs arbitrarily, send BGP communities, etc. -- and I'd even go so
far as to claim they typically don't want to.
[*] Excepting CPE equipment, which would need a simple BGP speaker.
Eddy
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